Transformation graph for quick calculation of concatenated transforms

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5

Example:

transformAToB = vtk.vtkGeneralTransform()
a = getNode('MRHead').GetParentTransformNode()
b = getNode('CTChest').GetParentTransformNode()
slicer.vtkMRMLTransformNode.GetTransformBetweenNodes(a, b, transformAToB)

If you want to use transformAToB in a transform node using SetTransformToParent then you have to deep-copy it using slicer.vtkMRMLTransformNode.DeepCopyTransform. If you only have linear transforms it is much simpler and faster to use GetMatrixTransformBetweenNodes and SetMatrixTransformToParent.

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